Sorry to hear that you still have problem with your 3820. In your previous post, it also locked up even when at stock frequency. Is that right? If VRMs are too hot, system should throttling CPU frequency, not lock up. So, something else in play here, not temps.
I noticed you're running both P95 & IBT at the same time. Did it locked up when running separately?
This is my 4.6GHz OC. I only ran P95 for one hour. I don't remember the ambient at that time but at least 31C. Offset +0.33 (vcore 1.360V).
Manual vcore 1.376V. Temp a couple degrees higher because higher voltage.

How much paste you guys use...this last reseat I did a thick strip down the lid...don't know if to much...more than I normally do...tried to boot that 4.750@1.28...not happening for me...trying 4.825@1.435 right now....we will see

How much paste you guys use...this last reseat I did a thick strip down the lid...don't know if to much...more than I normally do...tried to boot that 4.750@1.28...not happening for me...trying 4.825@1.435 right now....we will see

I love this toy, I was playing around with my combo since I haven't had time these last few days. This is just fly by testing, started with 125 strap and slowly raising multi. I haven't tried priming but it probably won't be stable but from 4.5 to 4.75 at same settings. Vcore is 1.34 in bios LLC at very High. I'm surprised how good these 3820 perform for that price.

My voltage for 4.3Ghz is 1.187v stable P95 and I didnt even try lower so yes, a better chip is the key
I havent had the time to push for the 5Ghz but im pretty sure this chip will do just fine although im lacking a bit in cooling with an Antec 620.
Oh, and mobo helps too! My Fatal1ty Pro works wonders keeping voltages stable and nice.